Power Electronics
Code
11243
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Engenharia Electrotécnica
Credits
6.0
Teacher in charge
Stanimir Stoyanov Valtchev
Weekly hours
4
Total hours
52
Teaching language
Português
Objectives
This subject aims at the acquisition by the students of sufficient knowledge and competence in the area of power electronics, where the students should be capable to select and/or design the most suitable power converter for a certain application. Students must acquire knowledge about the composition, properties and functioning of the power electronic circuits and devices. Students should become able to design and build some circuits, following given specifications. Students should also develop soft skills such as: ability to categorize priorities in the analysis of a technical problem, ability to make structured and clear decisions and improve their written and oral communication skills. The final objetive is to contribute to a more interdisciplinary profile of the student, and thus to improve his employability. For this reason some additional matter is included which is concerned with the more advanced topics of the modern power electronics.
Prerequisites
N/A
Subject matter
Contents (basic and general course):
Introduction. Converters. Power electronics, Contactless energy transfer and energy harvesting.
Converter DC-DC. Chopper. BUCK, BOOST, BUCK-BOOST, FORWARD and FLYBACK, continuous and discontinuous current operation. Control methods.
Electronic devices to control the energy. Diodes. Thyristors. Application limits and protection. Triac. BPT, Power MOS, characteristics and applications. SOAR, gate drive, IGBT, GTO, MCT.
Line commutated converter. Principles. Mono-phase and N-phase rectifier. Voltage multipliers. Protection. AC switch and regulator.
Voltage inverter and current inverter. Single phase inverter, three phase inverter. Resistive and complex load. Harmonics reduction. Multilevel converters.
Aided commutation. Series and parallel inverters. Resonant load, Induction heating, DC-DC converters with internal resonant loop. Control. Resonant switches.
DC motor control. Induction and Brushless PM motors drives. Renewable energy applications.
Contents (advanced topics):
Efficient energy conversion: soft switching, resonant converters; resonant switches, efficient magnetic elements. Power management and matching of complementary energy sources.
Efficient management of stored energy: electric vehicle battery management, state-of-charge and state-of-health of the battery.
Energy Harvesting: from the environmental energy (not used up to now), to supply power to equipment. Sources of harvested energy: thermal, hydraulic, pressure, mechanic vibrations, photovoltaic, electromagnetic, etc. Transducers of energy: electrical, mechanical, electronic, mixed. The human body and its activity as a source of energy: walking, working, breathing, etc. Specialized power converters: highest efficiency, lowest consumption, impedance matched, etc.
Wireless (contactless) energy transmission: transferring energy across the vacuum, water or air, making use of fields and not wires: at higher and lower power level (inductive and capacitive power transfer, electric busses, medical devices). Large distance transfer (near and far field): strong resonance, space energy projects, rectennas and directed beam transfer. Efficiency and on-line charging infrastructure for EV. Direct harvesting of solar light electromagnetic oscillations.
Bibliography
Ned Mohan, Power Electronics and Drives, MNPERE, 2003
Power Electronics, Converters, Applications and Design, N. Mohan, T. Undeland, W. Robbins, Ed.: John Wiley & Sons Inc., 2002
Power Electronics, Circuits, Devices and Applications, M. Rashid, Editora: Prentice Hall, 1993
Electrônica de Potência (em tradução), Muhammad H. Rashid, Makron Books do Brasil, S. Paulo, 1999
Power Electronics, C. Lander, McGraw-Hill, 1999
Eletrónica Industrial (em tradução) C. Lander, McGraw-Hill Brasil, 2002
Power Electronics, K. Thorborg, Editora: Prentice Hall, 2002
Principles of Power Electronics, J. Kassakian, M. Schlecht, G. Verghese, Editora: Addison Wesley, 1991
Electrónica de Potência, F. Labrique, J. Santana, Editora: Fundação Gulbenkian, 1991
Teaching method
Theoretical-practical classes; seminar classes and laboratory.
Evaluation method
1st Way: test No.1 (30%, but with a minimum note of 8, being this test eliminatory, i.e. not permitting continuing this way), test No.2 (45%), 4 reports on laboratory exercises (25 % of the final note, being the reports compulsory for the permission= frequency);
2nd Way: 4 reports on laboratory exercises (25 % of the final note, being the reports compulsory for the permission= frequency), exam of retrying (75%).